Tunable actuators based on sma for morphing applications: Experimental characterization of partialmartensitic transformations
Başlık çevirisi mevcut değil.
- Tez No: 727136
- Danışmanlar: PROF. PAOLO BETTINI
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: Politecnico di Milano
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 114
Özet
Özet yok.
Özet (Çeviri)
Shape Memory Alloy actuators are designed to activate smart structures supplying force or displacement. Generally, the ON/OFF configuration is used, that is to say that the SMA element transforms completely when heated, expressing at once the maximum force/displacement for which it was designed. The variable displacement and force are obtained through a so-called Shape Memory Alloy tunable actuator. Usually, to acquire this capability, the complex actuating system relies on multi-actuators assembled in parallel or series configuration. But these configurations increase the complexity and cost of the system. The aim of this work is to develop a Shape Memory Alloy tunable actuator by means of partial austenitic transformation. The transformation of SMA in actuators is usually achieved by Joule heating, supplying enough power to exceed austenitic finish temperature. Fine control of the electric power, managed either through voltage or current, can allow a similar control of the degree of transformation and therefore of the level of force/displacement generated. This also facilitates the control of the Shape Memory Alloy tunable actuator. With these developments, the desired variable response is acquired. To realize the final aim of this project, a Shape Memory Alloy actuator, in particular, Nitinol wire, is examined in detail. In the first part of work, the material thermo-mechanical characterization is done through Differential Scanning Calorimetry (DSC) and Isothermal Tensile Test. Then, another important part is devoted characterizing partial transformations. To achieve this characterization, a new experimental setup is developed with respect to the one used in previous works, considering previous limitations in the experiment. Then, to characterize tunable actuators and to obtain phase diagram for different loads, the analyses are examined against different weights. Lastly, to prove the tunability of the actuator, the results of the previous characterization are used to control a morphing structure
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